Legended can be used as a symbolic wrapper for data elements and datasets in charting functions such as BarChart.
The legend entry associated with Legended[expr, lab] includes an identifying prototype, such as a color swatch, for expr, displayed with the label lab.
The label lab in Legended[expr, lab] can be any expression, including graphics.
Legended[expr, Placed[lab, pos]] can be used to create legend entries for legends at different positions in a chart.
EXAMPLES
Basic Examples 
